1996A&AS..120C.423C

Query : 1996A&AS..120C.423C

1996A&AS..120C.423C - Astron. Astrophys., Suppl. Ser., 120C, 423-426 (1996/December-3)

Possible detection of π0-decay γ-ray emission from Cyg OB2 by EGRET.

CHEN W., WHITE R.L. and BERTSCH D.

Abstract (from CDS):

We report possible detection of π0-decay radiation from Cyg OB2, a nearby (1.7kpc) massive OB star association. The EGRET flux (>100MeV) maps clearly indicate a point source whose error circle includes both Cyg OB2 and Cyg X-3. We show that Cyg X-3 is unlikely to be the counterpart for the EGRET source, because of the marginal spatial consistency and the lack of the 4.8-hour modulation seen in other high energy emissions from Cyg X-3. If confirmed, this will be the first detection by EGRET of massive stars.

Abstract Copyright: ∼

Journal keyword(s): (stars:) circumstellar matter - stars: individual: Cyg X-3 - gamma rays: observations - gamma rays: theory - associations: Ass Cyg OB 2

CDS comments: Special Issue "3rd Compton Symposium"

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 951 0
2 [MT91] 213 Psr 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 334 0
3 BD+40 4219 * 20 32 13.8219154968 +41 27 12.006516060 11.50 11.40 10.22     O7III((f)) 115 0
4 BD+40 4220 s*b 20 32 22.4238071594 +41 18 18.942475904 11.32 10.61 9.185     O7Iafep 414 0
5 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
6 Schulte 15 SB* 20 32 27.6544131144 +41 26 22.073616744 12.39 12.30 11.10     O8V+B 55 0
7 Schulte 22 SB* 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 76 0
8 Schulte 9 s*b 20 33 10.7362926720 +41 15 08.222370372 13.38 12.77 10.96     O5I+O4III 243 0
9 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
10 Schulte 7 * 20 33 14.1095938872 +41 20 21.904113804 12.24 12.00 10.55     O3If* 153 0
11 BD+40 4227B * 20 33 14.7561575856 +41 18 41.750437968 11.99 11.64 10.70     O6II(f) 83 0
12 BD+40 4227A SB* 20 33 15.0781182864 +41 18 50.479292556 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 253 0
13 Schulte 8C * 20 33 17.9820761856 +41 18 31.194812988 12.2 11.43 10.19     O4.5III(fc) 89 0
14 Schulte 18 * 20 33 30.7901427336 +41 15 22.693080852 13.38 12.54 10.860     B1I 51 0
15 Schulte 19 s*b 20 33 39.1040288712 +41 19 25.992295824 12.91 12.77 10.944 10.38   B0Iab+B-O 73 0

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